Power-Down Time Acquisition Circuit for Display Stability
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Solution Overview
Problem
Display devices face issues with poor performance and failure when powered off and then quickly powered on, leading to display failures such as black screens or crashes due to improper voltage handling during power-down and power-on transitions.
Innovation Solution
A driving control circuit that includes an input terminal, a power-down time acquisition circuit, and a switch circuit, which detects the power-down time period for the input voltage to decrease to a lowest voltage and generates a switch control signal to determine whether to transmit the input voltage to the output terminal, preventing voltage transmission during quick power-on to prevent display failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the switch circuit transmits input voltage during quick power-on, then the power-on response speed is improved, but display failures occur due to improper voltage handling
Solution Approach 1:
The power-down time acquisition circuit performs preliminary detection of the power-down time period before the switch circuit decides to transmit voltage. By measuring how long the input voltage remains below the threshold voltage and comparing it with a preset threshold, the system determines whether a quick power-on condition exists, preventing display failures before they occur.
Solution Approach 2:
The power-down time acquisition circuit acts as an intermediary between the input voltage source and the switch circuit. It processes the voltage signal, measures the power-down time period, and generates a switch control signal that mediates whether the switch circuit should transmit the input voltage, thereby preventing direct transmission during quick power-on conditions.
2Reliability
If the power-down time detection is implemented, then the display reliability is improved, but the device complexity increases
Solution Approach 1:
The power-down time acquisition circuit performs multiple functions: it detects when the input voltage drops below the threshold, measures the duration of the power-down period, compares the measured time with a preset threshold, and generates the switch control signal. By consolidating these functions into a single circuit module, the patent reduces overall circuit complexity while maintaining display reliability.
3Reliability
If the switch control signal is generated based on power-down time comparison, then the quick power-on protection is improved, but the response time increases
Solution Approach 1:
When the power-down time period is less than the preset threshold (indicating normal power-on), the switch control circuit quickly generates a switch control signal to turn on the switch circuit, allowing the input voltage to be transmitted without unnecessary delays. The system rushes through the voltage transmission process when safety conditions are met, minimizing response time loss.
Data Source
AI summary
A driving control circuit, a driving control method, and a display device are disclosed. The driving control circuit includes an input terminal, a power-down time acquisition circuit, an output terminal, and a switch circuit. The input terminal is configured to receive an input voltage; the power-down time acquisition circuit is configured to detect a power-down time period required for the input voltage to decrease to a lowest voltage, the power-down time period is used to generate a switch control signal; the output terminal is configured to output a voltage; and the switch circuit is configured to receive the input voltage and determine, according to the switch control signal, whether to be turned on to transmit the input voltage to the output terminal for output.